| 摘要 |
PROBLEM TO BE SOLVED: To provide an excavation tool capable of excavating an excavated hole with a different diameter without preparing any kind of tool in the excavation tool equipped with cutting bits 3. SOLUTION: For the excavation tool constituted by providing the cutting bits 3, 3, etc., to the front end of the tool body l rotated around the axis 0, the cutting bits 3, 3, etc., are put on the front end of the tool body 1 through a cartridge 2 mounted to the front end of the tool body 1 in a detachable manner. A plurality of cartridges 2, 2, etc., are mounted to the front end of the tool body 1 so that they can be extended to the circumference from the inside circumference parallel with the tangential direction of a circle with the axis 0 as the center by seeing from the front end side, the cartridge 2 brings the rear section 7b into contact with a stage 4 formed in the front end of the tool body 1 and, at the same time, the inside end section 2A is brought into contact with the front section 2F of the cartridge 2 adjacent to a backward side of the rotational direction of the cartridge 2 and is mounted.
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